EIO

Eio or EIO may refer to:

Eio (river) in Norway Eio Books, an American publishing house Eio Sakata (1920–2010), Japanese professional Go player Environmental Investment Organisation European Investigation Order Extended interaction oscillator Enhanced Input/Output, an extension interface for printers, see JetDirect § EIO Input/output error, a POSIX error code represented as EIO Eiō, one of the eight major titles of professional shogi